gre: used time_before for comparing jiffies

The functions time_before is more robust for comparing
jiffies against other values.

Signed-off-by: Wei Yongjun <yjwei@cn.fujitsu.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

1 files changed, 3 insertions, 2 deletions

diff --git a/net/ipv4/ip_gre.c b/net/ipv4/ip_gre.c
index 07a188afb3ac..e62510d5ea5a 100644
--- a/net/ipv4/ip_gre.c
+++ b/net/ipv4/ip_gre.c
@@ -491,7 +491,7 @@ static void ipgre_err(struct sk_buff *skb, u32 info)
         if (t->parms.iph.ttl == 0 && type == ICMP_TIME_EXCEEDED)
                 goto out;
 
-        if (jiffies - t->err_time < IPTUNNEL_ERR_TIMEO)
+        if (time_before(jiffies, t->err_time + IPTUNNEL_ERR_TIMEO))
                 t->err_count++;
         else
                 t->err_count = 1;
@@ -803,7 +803,8 @@ static int ipgre_tunnel_xmit(struct sk_buff *skb, struct net_device *dev)
 #endif
 
         if (tunnel->err_count > 0) {
-                if (jiffies - tunnel->err_time < IPTUNNEL_ERR_TIMEO) {
+                if (time_before(jiffies,
+                                tunnel->err_time + IPTUNNEL_ERR_TIMEO)) {
                         tunnel->err_count--;
 
                         dst_link_failure(skb);